Computing-scale.



w. R. MITTENDORF.

COMPUTING SCALE.

APPLIUATION FILED DEO.16, 1907.

Patented Mar. 30, 1909.

2 SHEBTS-SHEET 1.

INVENTOR. William R. Mitt e11 dorf.

WI TNESSES: W774. af

A TTORNEY.

W. R. MITTENDORF.

COMPUTING SCALE.

APPLIUATION FILED DEO.16, 1907.

Patented Mar. 30, 1909.

2 sums-21mm 2.

INVENTOR. William R Mificmlorf WITNESSES: WW M 71 4% ATTORNEY.

UNITED STATES PATENT OFFICE.

WILLIAM R. MITTENDORF, OF ANDERSON/INDIANA, ASSIGNOR TO THE ANDERSON TOOL COMPANY, OF ANDERSON, INDIANA, A CORPORATION OF INDIANA.

COMPUTING-SCALE Specification of Letters Patent.

Patented March so, 1909.

Application filed December 16, 1907. Serial No. 406,635.

To all whom it may concern:

Be it'known that I, WILLIAM R. MITTEN- DORF, of Anderson, county of Madison, and

State of Indiana, have invented a certain new and useful Computingscaleyand I do hereby declare that the followin is a full, clear, and exact description thereo reference bein had to the accom anyin drawings, in whic like numeralsre er to l' e parts.

The object of this invention is to improve the construction and operation of computing scales, and especially t 'ose of the drum type or which have revoluble meansfor indicating the effect of an applied load and which are wholly automatic. V 7

One featureof this invention is to'provide a construction that enables the operator to readily oscillate the drum horizontally to make it face him in any position and yet the operation of the device in no manner be affected by such-horizontal oscillation of the drum. Along withthe foregoing is the idea of a swivel connection between the drum and the means controlled by the weighing lever, which permits the horizontal oscillation of the drum.

' In drum scales heretofore it has been difficult to make a uniformly accurate scale because of the difficulty in the action of the Wei hing lever to cause 'an entire revolution of t e drum on which the graduation is located. -It has been necessary in practice heretofore touse springs (Sr-other means for multiplying the power: employed to rotate the drum, to cause an entire revolution thereof, but the actionupon suchmeans of the variations in temperature has'rendered its operation ununiform and inaccurate. It has been sought to overcome this difficulty by the addition of thermostats and the like. This,

however, makes a complicatedstructure.

One ob'ect'of my present invention is to remedy-t e difiicultyreferred to hy-simple mechanical means, not infiuencedby changes in temperature. One feature contributing to the accomplishment of this result is the provision of a flexible means for transmitt ng power from the weighing lever to the drum shaft which means has-asplit end at its connection with the drum shaft so that the end or ends of said connecting means secured on the drum shaft in no manner interfere .the means controlle with said connecting means as it winds and unwinds on the drum shaft. Along with the foregoing is the provision of a weight acting on t e drum shaft that moves in a direction. opposite to that of the applied load when ut' on the platform or load receiving mem er, for holding taut the means connecting the drum shaft with the means controlled b the weighing lever, whereby said weight wi act 1n 0 position to the effect'of the a plied load.

in t e revolution of the drum. combined with the foregoing means a coun- I ter-Weight normally in a raised position that also travels in the direction of the load re ceiving member under an applied load and in apposition to the weight of the drum shaft.

ese and the various other featuresof my invention will be understood from the accompanying drawings the following description and claims.

T ere is also In the drawings Figure 1 is'a side elevation of the device with the internal parts indicated by dotted lines. Fig. 2 is a, central transverse section through the vertical portion of the scale showing the parts in their idle positions. Fig. 3 is the same as Fig. 2 with the parts in their actuated positions. Fig. 4 is a perspective view of the middle portion of t e and flexible connection thereon. Fig. 51s a rum shaft with the weight vertical section showing the swivel connection between the stri v by the lever.

In detail the'drawings show a base 10 with bearin 11 for the weighing lever 12 which at one en carries the platform or load receiving member 13. I There is means for maintaining the horizontal position of the platform which consists of the stem 14 secured thereto. and which rojects into the cas'in 15 and turns upward and at its up or en is pivoted to the bar 16 that-is fu crumed at 17. Theweighin lever 12 projectstoward the casing 15 and t e flexible connectionor strip 18 exon the drum shaft and tends vertically from the eccentric disk 20 on the shaft 21 that is mounted in thecasing on the arms 22 through the opemng 23 down to the weighing lever 12. Said we g in lever also has a weight 24 for norma 1y ba ancing the load receiving member. A

segment 30is rigidly secured to the shaft 21 and to it a normally raised weight 32 is conon one continuous shaft nected. The up er end of the casing 15 is cylindrical and as a bearin collar 33 on which the base of the drum frame 34 is revolubly mounted, as shown in Fig. 2. The drum frame consists in addition to said base of the ends 36 and the bearing plates 37 for the drums 38 and a cylindrical cover or casing 39 for the drums. I provide two drums separate from each other and both secured 40mounted in the U on said drums numerals indicating weig ts and total values are disclosed through the slots 41 in the casing and upon the case prices er pound are placed. Between the drums t ere is a cylinder 42 secured to the shaft 41 so as to. form practically a part of said shaft. To said cylinder I hang the weight 43 by a cord 44 that tends to turn the drums in one direction. To said cylinder 42 I secure the. split ends 45 of the flexible connection or strip 46 that when drawn tends to revolve the drums in a direction op osite to the action of the weight 43. To theower end of the flexible strip 46, see Fig. 5, there is secured a rod 47 having a ball 48 on its lower end, said rod extendin through the central opening the swive plate 49 on the upper end of the frame 50 that is secured to the flexible strip 51, which at its lower end is fastened to the lower segmental surface of the segment 30.

The operation of the scale is as follows. The parts in their unoperated position are as shown in Fig. 2, the flexible connection 46 being wound on the shaft of the drum and the weight cord 44 being relatively unwound. The weight 43 therefore acts against the weight 32 and holds it in a normallyraised position and permits the inner end of the weighing lever 12 to move downward and to hold the platform 13 elevated normally. When the load is placed uponthe latform 13, it elevates the inner end of the ever 12, relaxes the connection 18 with said lever, and thus ermits the weight 32 to mov'e downward y in the same direction as the platform moves and through the flexible connection formed by the strips 51 and 46 to revolve the drums against the action of the weight 43. The diminishing effect of the weight 32 as it moves downwardly toward its center of gravity is counter-balanced by the eccentric 20 which correspondingly throws the'tangential point of the strip 18 on said eccentric farther away from the axis thereof. When the load is removed the weight 43 returns the parts to theirnormal position. This construction ermits the orizontal oscillation of the rum on the bearing collar 33 to make the reading side of the drum face the operator as desiredand by reason of the swivel construction and the flexible connection between the drum shaft plates 7 37.

and the lower part of the device such oscillation of the drums will have no effect upon the action and accurac of the scale.

The words lapping and foverla ping are used herein to mean the same as apping upon, the idea being that the strip 46 as it coils on the cylinder 42 does not ap upon itself when the cylinder'is turned to the limits provided for in the construction. That is, no portion of the strip 46 and split ends 45 engage or he upon any other portion of said strip 46 or split ends 45 but miss and disengage each 0t er in coiling.

What I claim as my invention and desire to secure by Letters Patent is:

1. A scale including aweighing lever, oscillatory means for indicating the eflect thereon of an ap lied load, and a single flexible connection between them, partially bifurcated and separate at the end thereof which is secured to said indicating means, substantially as set forth.

2. A scale including a weighing lever, oscillatory means for indicating the effect thereon of an applied load, a shaft for oscillating the indicating means, and a flexible connection between the lever and said shaft that is normally coiled on the shaft so that when drawn downwardly it will actuate the drum, the end of said flexible connection being bifurcated and the ends of the bifurcated portions being spread laterally and secured to the shaft whereby no part of said flexible connection will lap upon and en age any other part thereof during the revolu le movement of the drum.

3. A scale including a weighing lever, an oscillatory indicating means, a weight, means controlled by said lever for holding the weight in a normally raised position when there is no load, a flexible connection between said weight and the indicating means for actuating the latter under the influence of the weight and an applied load, and a weight in connection with said indicating means which acts in opposition to said first mentioned weight to return the indicating .means to its normal position and to maintain said first mentioned weight in a normally raised position.

4. A scale including a lever with one end weighted, a load-receiving member on the other end thereof that without a load does not counterbalance said weighted end, an oscillatory shaft, a connection between said shaft and the weighted end of said lever,

whereby the latter will tend to return said shaft to its normal position, a counterweight mounted in connection with said shaft that is normally in a raised position and under the influence of a load moves in the same direction asthe load-receiving member and actuates said shaft, an oscillatory indicating means, a connection between said shaft and l fixed my signaturein the presence of the witsi'aid indicating means that hactll'llate sail in I nesses herein named.

icating means, an a wei t t at ten s to 1 v m return said indicating meais to normal and W ILLIAM MITLENDORF' 5 to hold the weight connected with said shaft 1 Witnesses:

in a normally raised position. B. D. EMANUEL,

In witness whereof, I have hereunto af- I. J. CUsHING. 

